Tunable Molecular Packing of Dopant-Free Hole-Transport Polymers for Perovskite Solar Cells
作者:
Fu, Q (Fu, Qiang) [1] , [2] , [3] ; Liu, H (Liu, Hang) [1] , [2] , [3] ; Gao, YP (Gao, Yuping) [1] , [2] , [3] ; Cao, XJ (Cao, Xiangjian) [1] , [2] , [3] ; Li, Y (Li, Yu) [1] , [2] , [3] ; Yang, Y (Yang, Yang) [4] ; Wang, J (Wang, Jian) [4] ; Chen, YS (Chen, Yongsheng) [1] , [2] , [3] , [5] ; Yao, ZY (Yao, Zhaoyang) [1] , [2] , [3] ; Liu, YS (Liu, Yongsheng) [1] , [2] , [3] , [5]
DOI
10.1021/acsenergylett.3c00855
在线发表
JUN 2023
已索引
2023-06-27
文献类型
Article; Early Access
摘要
Optimizing the molecular packing and orientation of dopant-freehole-transport materials (HTMs) to promote their charge transportis a challenging but effective strategy for achieving high-performanceperovskite solar cells (PSCs). Here, we successfully demonstratedtunable molecular packing and orientation of polymers by regulatingthe donor building blocks by shifting the conjugated side chain tothe main chain and using a large core unit. The conjugated polymerwe developed, namely PC-DPP, with a thiophene-substituted phenanthrocarbazole(PC-T) as a donor unit and diketopyrrolopyrrole (DPP) as an acceptorunit, shows a preferred face-on orientation. By contrast, the controlPBDT-DPP polymer shows a preferred edge-on orientation. As a result,the PC-DPP film shows enlarged hole mobility and strengthened interfacialcontact with the perovskite surface. Consequently, in contrast tothe PBDT-DPP HTM, the device using dopant-free PC-DPP dramaticallyimproved the efficiency from 17.27% to 22.67%. This work paves a newpath for developing dopant-free HTMs.
